80 days late?

I have always had regular periods, then I was on the pill and was even more regular. I was only on the pill for 1 1/2 years and got off of it in October 2014. Since then my periods have been a little irregular but nothing too extreme. Then a couple months ago I skipped a whole month, took a pregnancy test and it was negative. I started my period again and then it was normal. Now, I'm back to being irregular... It's been 80 days since my last period. I've taken two tests and both were negative. My husband and I are trying to conceive, so this is extremely frustrating!